That thou mayest tell. — Those who experience God’s mercies are bound to hand on the memory of what He has done for them to future generations. Natural gratitude would prompt such action. But, lest the duty should be neglected, the Israelites had it at this time constantly enjoined upon them (Exodus 12:26; Exodus 13:14; Deuteronomy 32:7; Joshua 4:6, &c):

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